Added Postmark recognition

app/src/main/java/eu/faircode/email/MessageHelper.java

@@ -1684,6 +1684,10 @@ public class MessageHelper {
         if (!TextUtils.isEmpty(mailchimp))
             return "mailchimp";
 
+        String postmark = imessage.getHeader("X-PM-Message-Id", null);
+        if (!TextUtils.isEmpty(postmark))
+            return "postmark";
+
         return null;
     }
 

app/src/main/res/drawable/infra_postmark.xml

@@ -0,0 +1,13 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="30dp"
+    android:height="30dp"
+    android:viewportWidth="30"
+    android:viewportHeight="30">
+  <path
+      android:pathData="m2,0h4.3158v1.5789h6.3158v-1.5789h4.7361v1.5786h6.3158v-1.5786h4.3165c1.1046,0 2,0.8954 2,2v4.3158h-1.5791v6.3158h1.5791v4.7368h-1.5791v6.3158h1.5791v4.3158c0,1.1046 -0.8954,2 -2,2h-4.3165v-1.5793h-6.3158v1.5793h-4.7361v-1.579h-6.3158v1.579h-4.3158c-1.1046,0 -2,-0.8954 -2,-2v-4.3158h1.5791v-6.3158h-1.5791v-4.7369h1.5788v-6.3158h-1.5788v-4.3157c0,-1.1046 0.8954,-2 2,-2zM19.4202,15.3701c0.8526,-0.8594 1.279,-1.9806 1.279,-3.3636 0,-1.1145 -0.1947,-2.0075 -0.5841,-2.6789 -0.3895,-0.6781 -1.034,-1.1816 -1.9336,-1.5106 -0.893,-0.329 -2.1015,-0.4935 -3.6255,-0.4935h-5.6498v1.8933h1.8934v11.39h-1.8934v1.8933h6.1634v-1.8933h-1.9739v-3.9276h1.994c2.0343,-0.0134 3.4778,-0.4498 4.3305,-1.3092zM17.5369,9.8815c0.5573,0.4364 0.8359,1.128 0.8359,2.0746 0,0.7452 -0.1309,1.3294 -0.3928,1.7523 -0.2618,0.4163 -0.6713,0.7117 -1.2286,0.8863 -0.5572,0.1678 -1.3025,0.2517 -2.2357,0.2517h-1.42v-5.6295h1.5811c1.3495,0 2.3029,0.2216 2.8601,0.6647z"
+      android:fillColor="#fade4b"
+      android:fillType="evenOdd"/>
+  <path
+      android:pathData="m20.6992,12.0065c0,1.383 -0.4264,2.5042 -1.279,3.3636 -0.8527,0.8594 -2.2962,1.2958 -4.3305,1.3092h-1.994v3.9276h1.9739v1.8933h-6.1634v-1.8933h1.8934v-11.39h-1.8934v-1.8933h5.6498c1.524,0 2.7325,0.1645 3.6255,0.4935 0.8996,0.329 1.5441,0.8325 1.9336,1.5106 0.3894,0.6714 0.5841,1.5644 0.5841,2.6789zM18.3728,11.9561c0,-0.9466 -0.2786,-1.6382 -0.8359,-2.0746 -0.5572,-0.4431 -1.5106,-0.6647 -2.8601,-0.6647h-1.5811v5.6295h1.42c0.9332,0 1.6785,-0.0839 2.2357,-0.2517 0.5573,-0.1746 0.9668,-0.47 1.2286,-0.8863 0.2619,-0.4229 0.3928,-1.0071 0.3928,-1.7523z"
+      android:fillColor="#333"/>
+</vector>